Exhaust-muffler



T. s. KEMBLE.

EXHAUST- MUFFLER.

APPLICATION FILED NOV. 22, 1916.

Patented Nov. 9, 1920.

2 SHEETS-SHEET I.

avwewtoz THoMAs 5. KEM BLE T. S. KEMBLE. EXHAUST MUFFLER. APPLICATION FILED NOV. 22. 1916.

Patented Nov. 9, 1920.

2 SHEETS-SHEET 2.

31400144301 THoMAs5. KEMBLE 1 UNITED STATES PATENT OFFICE.

THOMAS S. KEMBLE, OF BUFFALO, NEW YORK, ASSIGNOR TO CURTISS AEROPLANE AND MOTOR CORPORATION, A CORPORATION OF NEW YORK.

EXHAUST-MUFFLER.

T 0 all whom it may concern:

Be it known that I, THOMAS S. KEMBLE,

a citizen of the United States, residing at Buffalo, in the. county of Erie and State of New York, have invented certain new and useful Improvements in Exhaust-Mufflers, of which the following is a specification.

My invention relates in general to internal combustion engines and more particularly to that class of engines which are used for aeronautical work. It has for its object the mufiling of the exhaust from the motor and accomplishes silent operation with less loss of power than usually attends the usage of othertypes of silencers or mufilers.

Essentially, my invention consists of an attenuated cone for the outlet end of the exhaust piping or manifold which carries throughout its entire length a slot, opening or aperture of certain fixed and definlte dimensions. Through this slot the exhaust gases are dissipated in such manner that the usual explosion of the exhaust is rendered silent by reason of the relation of the dimensions of the slot to the piston displacement per cylinder and the firing period of the motor.

In order to eliminate the back pressure due to an attenuated manifold I construct the manifold so that its outlet area is considerably greater than the area of any cylinder exhaust port. The gases therefore are free to expand throughout their passage from the motor to the muffler which point they are discharged through the slot in the side of the cone structure. As

the gases are gradually discharged, a smaller sectional area is re uired for their proper passage, which diminishing sectional area is provided bythe conical shape of the muffler.

My invention is here illustrated in connection with an eight cylinder motor of the V-type but it is equally adaptable to one or any ,multiplicity of cylinders in any of several arrangements. I

Of the drawings:

Figure 1 is an elevatlon showing my muffler assembled to an aeroplane and motor;

Fig. 2 is a" rear elevation in which the muffler is shown with conduits leading to the exhaust manifolds of the cylinders of each bank in a V-type motor;

Specification of Letters Patent.

proper at Patented Nov. 9, 1920.

Application filed November 22, 1916. Serial 110,132 824.

Fig. 3 is a longitudinal section through the muffler;

Fig. 4 is a lateral section through the mufiler; v

Fig. 5 is a plan of an exhaust manifold;

Fig. 6 is an elevation of an exhaust manifold;

Fig. 7 shows the'muffler and manifold assembled with an expanding conduit.

In Fig. 1 the muffler wholly'designated as 10 is suspended from the fuselage of the aeroplane 11 by means of the clamps or clips 12. Leading from the manifold 13 to the muffler 10 is a pipe or conduit 14 which preferably has a constantly increasing diameter throughout its length from the manifold 13 to the muffler 10, in order to v afford a free and unimpeded passage for the exhaust gases. In order to further expedite the fiow of gases I also construct the manifold 13 so that its extreme outlet area is greater than that of any exhaust port. This is apparent .from Fig. 5 in which 15 are the expanding conduits leading from the respective cylinders and 16 is the point of attachment of the conduit 14. The mufiier proper is in the nature of an extension of the manifold, and, has a longitudinal slot or opening 17 The width of this'slot I make extremely small compared to its length and the length is proportioned so that the total area of the slot will bear- These flanges,

flanges 18 and the washers 19 and maintain the slot 17 at a practical] constant width throughout its length. he distance between the washers along the length of the slot is such that the necessary rigidity will be given to the slot construction.

Although. in other types of mufilers and silencers a large percentage of powereis always destroyed, due to back pressure, my invention has no such drawback since the construction of the silencer and the manifold is such that at all points along the path of the exhaust gas egress a'constantlv increasing sectional area is afforded. his construction also reduces to a minimum eddies which are largely responsible for pipe-friction and back-pressures which are resultant therefrom. In its preferred embodiment I use my mufier and manifold in connection With an expanding conduit as shown in Fig. 7. HOW6V6Z', the conduit 14: may be of uniform diameter throughout its entire len h as in Fig. 1.

- 'lthough I have, for purposes of clarity, disclosed my invention as, comprising certain specific constructional details, I do not consider it to be limited thereby, as it may consist of several embodiments Without in any way departing from the spirit of the invention.

What is claimed is:

1. In combination With an internal combustion engine, exhaust manifolds of constantly expanding sectional area from their inlets to their outlet, and a conical mufiler, said muffler being provided With anarrow outlet slot or aperture extending substantially throughout its length.

2. In combination with an internal combustion engine, expanding exhaust manifolds, a conical muifier slotted substantially throughout its length, the slot in said mufller serving as a direct outlet for the gases from the conical chamber to the atmosphere, and a conduit of expanding sectional area from its inlet to its outlet arranged to connect at its small and large extremities respectively with said manifold and said mufiler.

3. In combination With an aeronautical internal combustion engine, a conical longitudinally slotted muffler, the slot in said rnufier serving as a direct outlet for the gases from the muffler into the atmosphere, expanding exhaust manifolds and an expanding conduit to connect said manifolds to said mufier.

f. In combination with a multicylinder internal combustion engine, expanding exhaust manifolds, a conical longitudinally slotted mutter, the slot in. said muffler serving as a direct passage for the gases from the conical chamber to the atmosphere and an expanding conduit leading from said manifolds to said rnufiier. v

5.. A mufifler for an internal combustion engine comprising an elongated conduit gradually decreasing in crosssection from forward to the rearward end, said conduit being apertured throughout its length to provide for direct passage of the gases from the restricted'chamber of diminishing cross section to the atmosphere.

6. A. muffler for an internal combustion engine comprising an elongated and attenuated cone which is apertured substantially from its base to its apex, the apertures leading directly from the restricted conical chamber to the atmosphere, whereby the gases are free and entirely unimpeded after emergence from the conical restricted chain near/nee 7. In an internal combustion engine, a.

mufller comprising a conical conduit having a series of marginally flanged holes or apertures extending substantially from the base of said cone to the apex thereof, said apertures leading directly from the restricted chamber of the conical conduit to the atmosphere.

8. A mufier for an internal combustion engine comprising an attenuated coneapertured substantially from its base to its apex, the apertures leading directly from the re stricted conical chamber of the mulller to the atmosphere whereby the gases are free and entirely unimpeded after emergence from the conical restricted chamber.

9. In combination with a multi-cylinder internal combustion engine, expanding exhaust manifolds and a longitudinally slotted mufier comprising an attenuated cone, said cone having its base attached to said manifolds and having its slot emerge directly into the atmosphere.

10. muffler for an internal combustion engine comprising an elongated and attenuated conical conduit, said conical conduit having small lateral openings extending throughout its length for the purpose set forth, said openings leading directly from the conical chamber of the conduit to the atmosphere.

11. A muiiler for an internal combustion engine, comprising an elongated and atten uated cone, said cone having a narrow slot extending substantially throughout its length for the purpose set forth, said slot openin directly into the atmosphere.

12. muffler for an internal combustion engine, comprising a conically shaped con duit of thin metal, having a pair of flanges formed thereon longitudinally of its length, said flanges inclosing a narrow slot extending throughout the elongated cone said slot opening directly into the atmosphere for the purpose set forth.

13., A muffler for an i engine, comprising a cor cal. shaped conduit of thin metal, having a pair flanges formed thereon and extending longitn ernal combustion thereof, said flanges nal outlet slot in sai I being maintained in a spaced r. el Gll' spacers positioned at interv .ls throughout their length.

I l. A. muffler for internal combustion engines comprising a casing having a chamber of gradually decreasing cross sectio al area from the'foremost to the rearmost distributed opening from one end o stricted chamber to the other providing for the direct emergence of the ases from the restricted chamber freei; and animpeded into the atmosphere.

In testimony Whereol s in" I S. I"

rally. a lo "itudi- 

